Search the Community
Showing results for tags 'occurrence'.
Found 2 results
-
Assessing the Probability of Species Occurrence and Detection with Occupancy Models Tuesday, Feb. 24, 2015; 8AM-5PM Cost: $60 USD Maximum Enrollment: 25 Presented by the Society for Northwestern Vertebrate Biology http://thesnvb.org/annual-meeting-2015/ Instructors: Mike Adams and Tara Chestnut, USGS Amphibian Research and Monitoring Initiative (ARMI Program) In ecological research, it is often of interest to ask questions about the probability of species occurrence when detection is imperfect. For example, how does the probability that a pond is occupied by red-legged frogs relate to the occurrence of non-native fish?; or the occurrence of a pathogen relate to water chemistry? Such analyses rely on survey data that result from efforts to detect the species of interest and measure site characteristics. These analyses are hampered by false negatives: the failure to detect a species at a site where it is present. Occupancy models can be used to estimate the probability that a site is occupied (and other parameters related to changes in occupancy) despite false negatives. They use repeated observations to estimate and account for the probability that a single observation will detect a species that is present. Since their initial development in 2002, there have been several important expansions of the occupancy modeling framework including multi-season models that estimate local extinction and colonization rates, two-species models that deal with false negatives in two species simultaneously, multi-state models that allow response categories beyond just presence and absence, and integrated habitat models that deal with sites that may or may not exist in a given year (e.g., ephemeral ponds). We have also come to better understand some of the pitfalls of occupancy models. The main goals of this workshop are to: 1) Offer a primer to the basic occupancy model and introduction to the free software program PRESENCE; 2) Overview of the range of occupancy models currently available; 3) Offer hands on experience to help get you started with occupancy studies and one-on-one consultations to address questions regarding your specific project. The target audience: Participants are beginners to occupancy analyses but have a basic understanding of regression analysis. To register: http://thesnvb.org/event/2015-meeting-registration/ Please bring your own PC laptop with the latest version of PRESENCE installed (http://www.mbr-pwrc.usgs.gov/software). Otherwise you should be able to pair with someone with a laptop. Contact Michael_Adams@usgs.gov with any questions. -
Modeling Patterns and Dynamics of Species Occurrence The Modeling Patterns and Dynamics of Species Occurrence Workshop will be held at the Swiftel Center in Brookings, SD, 16-20 March 2015. NOTE: The workshop is strictly limited to a set number of registrants. OVERVIEW The presence or absence of a species across a set of landscape units is a fundamental concept widely used in ecology (e.g., species range or distribution, epidemiology, habitat modeling, resource selection probability functions, as a monitoring metric, metapopulation studies, biodiversity, and species co-occurrence). An important sampling issue, however, is that a species may not always be detected when present at a landscape unit. This will result in "false absences" causing parameter estimates to be biased if unaccounted for, possibly leading to misleading results and conclusions, even with moderate levels of imperfect detection. This workshop will cover many of the latest methods for modeling patterns of dynamics of species occurrence in a landscape while accounting for the imperfect detection of the species. Participants will be introduced to available software through worked examples, and there will be special emphasis on aspects of study design. While primarily aimed at the beginner and intermediate level, more experienced researchers will also benefit from attending. Topics to be covered include: single season occupancy models for patterns in species occurrence building predictive models for species occurrence creating maps of species occurrence probabilities, e.g., species distribution maps multiple-season occupancy models for dynamics of species occurrence and changes in distribution important study design considerations sample size determination FORMAT Format for the workshop will be a combination of lectures and exercises. The workshop will start on Monday morning, 8:30 AM, and at 8:00 AM Tuesday-Friday. The workshop will end at noon on Friday. South Dakota State University graduate students wishing to receive credit for the workshop also will need to register for WL792 Tp-Occupancy Modeling (3 credits) for the spring 2015 term. This is a written consent course, so students will need to obtain a signed Registration Authorization form from Dr. Grovenburg. INSTRUCTOR Dr. Darryl MacKenzie, Proteus Consulting Ltd. Darryl is an internationally renowned biometrician, particularly for his work on the development and application of species occurrence models. He has over 15 years experience in applying statistical techniques to ecological and environmental situations, starting at the University of Otago, then progressing to North Carolina State University (based at USGS Patuxent Wildlife Research Center) in 2000, before commencing full-time with Proteus in 2001. Darryl has provided advice on studies for a wide-range of species and enjoys the challenge of combining the statistical theory with the practical realties to develop a pragmatic solution. AGENDA A tentative agenda can be found in the Quick Links box above. Please note that this is a tentative schedule only. COST Registration cost for the 5-day workshop is $850. This fee includes course materials, facilities for the workshop, and morning and afternoon refreshments. All other costs (i.e., travel, lodging, meals, etc.) will be the responsibility of the workshop participant. REGISTRATION Please complete the registration form (available in the Quick Links box above) and forward with payment to: Dr. Troy Grovenburg Department of Natural Resource Management South Dakota State University Box 2140B, NPS 138 Brookings, SD 57007 Completed registration forms paying with credit card can be emailed to Dr. Troy Grovenburg. HOTEL ACCOMMODATIONS We have arranged for a block of rooms at state rates at the Fairfield Inn &Suites under SDSU Dept. of Natural Resources. http://www.sdstate.edu/nrm/organizations/gpnss Fairfield Inn &Suites 3000 LeFevre Drive Brookings, SD 57006 605-692-3500
